LCL型单相并网逆变器的功率解耦控制策略研究

Research on Power Decoupling Control Strategy ofLCL-type Single-phase Grid-connected Inverter

在dq旋转坐标系中,单相LCL型并网逆变器的有功功率与无功功率之间存在复杂耦合关系,会对逆变器的功率控制性能造成影响,为此,提出了一种基于LCL型单相逆变器的可实现功率解耦功能的控制策略。首先采用SOGI构造正交信号,然后进行坐标变换,再利用分步导入解耦项的方式消除功率耦合,最终通过仿真和实验验证其有效性。

In the dq rotation coordinate system,there is a mutual influence between the active power and reactive power of the single-phase LCL grid-connected inverter,which will have a negative impact on the power control performance of the inverter.To address this issue,this paper proposes a control strategy for the LCL-type single-phase inverter with a decoupling function.This strategy constructs orthogonal signals using the second-order generalized integration method,performs coordinate transformations,and gradually introduces decoupling terms to successfully eliminate the coupling between active and reactive power.This approach can significantly improve the power control performance of the inverter.Finally,simulations and experiments verify the effectiveness of the control strategy.